Pawl-and-ratchet mechanism.



F. CRiST,

PAWL AND RATCHET MECHANISM.

APPLICATION FILED AUG. 11. 1915.

Eatented Nov. 13, 1917.

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' F. CRIST;

PAWL AND RATSHET MECl'IANISM. APPLICATION FILED AUGJL 1915.

Patented Nov. 1 3, i917.

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UNITED STATES, PATENT OFFICE.

FRANK GR IST, OF COLUMBUS, OHIO.

PAWL-A'ND-RATGHET' MECHANISM.

Specification of Letters Patent.

Patented Nov. 13, 1917.

Application filed August 17, 1916. Serial No. 115,483.

My invention relates to an improvement.

in pawl and ratchet mechanism designed partlcularly for use with means for supporting drills on or against the work to be drilled and is an improvement on the con-j struction disclosed in my Patent No. 1,184,829 granted to me May 30th, 1916, and it consists in the parts and combinations of parts as will be more fully explained and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in side elevation of my improved device; Fig. 2 is a view in edge elevation of the same, and Figs. 3, 4L and 5 are views in section showing the pawl in its several positions.

1 represents a bit which in the present instance is actuated by air, but which may be driven by electricity or other suitable means, and 2 is a chamber carrying the motor for actuating the bit. Secured to one end of the chamber or drill casing, on the side opposite that from which the bit projects, is a centrally located stud 3 threaded externally, and inclined arms 4 supporting the ring 5 at their outer ends, the ring being concentric with the stud 3 for supporting the frame 6. I

This frame 6 is provided with a threaded socket to engage the stud, and is of a size and shape to snugly fit within and be supported by the ring 5 when the parts are assembled. It is bifurcated at its opposite end to receive and support the drum 7 which is mounted on the axle or pin 8 carried by the said frame. The drum 7 is preferably recessed as shown in Fig. -l to receive the ends of the end links of the chains 10, which are secured to the drum by the pin 9, and is provided at one or both ends, preferably both, with a ratchet wheel 11.

Both chains 10 leave the drum from the 7 same side, so that both will wind simultaneously in the same direction. Each is provided at its free end with aloop 12 having an opening 13 large enough for the passage.

of a chain 15-, and with a slot 16 communicating with said opening and of a size to recelve a chain link edgewise, so that .by passing a chain 15 through the opening 13 and dropping a link into the slot 16, the

chains 15 will be locked to chains 10, thus providing for close adjustment of the chain so that comparatively little slack will have to be taken care of after the machine has been set up. The free end of each chain 15 carries a hook 17 for its attachment to the work to bedrilled, or to any other fixed ob ect or objects adjacent to the work.

The frame 6 is slotted adjacent the point of bifurcation of the same as shown in Figs. 1 and 2 for the reception of the pawl 18 which is of a width sufiicient to engage the teeth of both ratchet wheels 11 as clearly shown in Fig. 2. The cylindrical portion of the frame below the slot is. made hollow for the stem 18 of the pawl and for the spring 18, which latter rests at its lower end on the shoulder 20 within the frame 6, and bears at its upper end against the shoulder 18 on the stem of the pawl. The

spring is always under tension and exerts :This sleeve embraces the frame 6 and closes the ends ofthe slot 22, and is normally retained against the shoulder 2%? on the frame by the spring 18*, acting of course through the stem 18 and pin 21. i

From the foregoing it will be seen that by giving the sleeve 24 a part turn, the pin 21 will be moved either up or down the inclined slots 23, thus carrying the pawl into or out of engagement with the teeth of the ratchet wheels. In Fig. 3 I have shown the pawl in engagement with the ratchet wheels, and in Fig. 5 I have shown it withdrawn so that the drum and ratchet may freely turn when applying the apparatus to a piece of work. Fig. i shows the movement of the pawl when turning the drum in a direction to wind the chains thereon.

Pivot-ally mounted on the pin or axle carried by the frame 6, is the handle 25 which is substantially identical in construction with the frame 6 except that the bifurcated end is widened to permit the free ends of its arms to straddle the arms of frame 6. It is provided with a pawl 26 spring 27 pin 28 and sleeve 29 substantially identical with the pawl arrangement on frame 6 except that the sleeve 29 is not slotted, the pin 28, being secured in holes in the sleeve so that by pulling upwardly or outwardly on the latter the pawl will be pulled away from the ratchet wheels, and when released will again be projected into contact with the teeth on the ratchet wheel.

By pulling on the handle to the left (Fig. 1) the chains will be wound on the drum until all the slack has been taken up thus rigidly supporting the drill in proper position with relationto the work. The application or setting up of the drill can be readily and quickly accomplished by adjusting the chains as to length, and subsequently taking up the slack by rotating the drum. The handle 25 may be of a weight sufficient to automatically turn the drum to take up the slack in the chains as the drill sinks into the work.

If the drill be boring upwardly the handle 25 may be turned to the right more than 90 so that its weight will turn the drum and take up the slack in the chains as the work progresses.

With this improvement the drill is supported by chains which are always under tension and the slack due to the penetration of the drill is automatically taken care of by the automatic or manual operation of the ratchet. It may be readily and quickly applied to any piece of work and be readily released after the hole has been drilled.

It is evident that many slight changes might be resorted to in the relative arrangement of parts shown and described without departing from the spirit and scope of my invention. Hence I would have it understood that I do not wish to confine myself to the exact construction and arrangemcnt of parts shown and described, but

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. In a pawl and ratchet mechanism, the combination of a frame carrying a ratchet wheel and a drum, a pawl having a sliding.

movement in said frame and adapted to engage the teeth of the wheel, a spring tending to normally hold the pawl in engagement with the wheel, a sleeve mounted to rotate on the frame and provided with an inclined slot, a pin engaging the stem of the pawl with its ends in the slot in the sleeve, so that by turning the sleeve the pawl will be withdrawn and held out of engagement with the teeth of the ratchet wheel, a handle pivoted to said frame and a longitudinally movable spring pressed pawl carried by said handle'and adapted to engage the teeth of the ratchet wheel.

2. In pawl and ratchet mechanism, the combination of a frame carrying a ratchet wheel and a drum, a pawl mounted to slide in said frame, a spring embracing the shank of the pawl for forcing it toward the ratchet wheel, a pin passing through the shank of the pawl and also through oblong slots in the frame, a sleeve mounted to' turn on said frame and provided with oppositely disposed inclined slots to receive the ends of the pin, a handle pivoted to the said frame, a spring pressed pawl carried by said handle, and a longitudinally movable sleeve mounted on the handle and connected with said spring pressed pawl for moving it out of contact with'the ratchet.

3. In pawl and ratchet mechanism the combination of a frame, a handle pivoted to the frame, a ratchet wheel mounted in the frame, a spring pressed pawl in the frame and also one in the handle both of said pawls adapted to engage the ratchet wheel carried by the frame, a rotary sleeve having connection with one of said pa-wls for moving and holding it out of engagement with the ratchet and a sliding sleeve having connection with the other pawl for moving it out. of engagement with the ratchet wheel.

In testimony whereof, I have'signed this specification in the presence of two subscribing witnesses.

FRANK CRIST.

lVitnesses C. H. WEBER, H. B. BING.

Copies 01 this patent may be obtained for fivecents eaoh,'by'addressing the0ommiss10ner o1 latents, Washington, I). U. 

